摘要
By comparing the large and medium-sized oil and gas fields,it is discovered that reservoirs in superimposed basins are most of multi-stage formation process,and the late accumulation is favorable for large-scale preservation.Based on summary of accumulation progress,characteristic and model of the vorious oil-gas pool,combined with features of the tectonic evolution of the study area,it composes the hydrocarbon accumulation pattern classification,and divides oil and gas multi-phase accumulation model into 5 types according to the criteria.